The state where the body’s allostatic systems, particularly the Hypothalamic-Pituitary-Adrenal (HPA) axis and metabolic regulation, are pushed beyond their capacity for adaptive response by chronic, unremitting stressors. This condition results in a loss of homeostatic efficiency and can lead to dysregulation across multiple endocrine pathways. The physiological consequence is often a cascade of compromised function, manifesting as chronic fatigue or burnout.
Origin
The concept stems from general systems theory and is applied to human physiology, particularly the endocrine and nervous systems, which are inherently adaptive. Overload specifically refers to the pathological exhaustion of allostasis, a term coined to describe the process of achieving stability through physiological or behavioral change. The HPA axis, central to stress response, is the primary system implicated in this overload state.
Mechanism
Sustained release of glucocorticoids and catecholamines eventually leads to receptor desensitization and impaired negative feedback loops within the HPA axis. This persistent allostatic load depletes the body’s energy reserves and diminishes cellular resilience. Consequently, the organism loses its capacity to mount an appropriate, proportional stress response, which fundamentally alters metabolic and immune function.
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